Number and percentage of invalid, positive, total (invalid plus positive) LSPT results with double- and single-window LSPT
| LSPT result | Double-window LSPT (n (%, 95% CI)) (n=492) | Single-window LSPT (n (%, 95% CI)) (n=555) | P value |
| Invalid | 18 (3.6, 95% CI 2.2 to 5.8) | 6 (1.1, 95% CI 0.4 to 2.4) | 0.006 |
| Positive | 6 (1.2, 95% CI 0.5 to 2.7) | 19 (3.4, 95% CI 2.2 to 5.3) | 0.024 |
| Total | 24 (4.9, 95% CI 3.3 to 7.2) | 25 (4.5, 95% CI 3.0 to 6.6) | 0.772 |
LSPT, low-sensitivity pregnancy text.